An excellent point, well done. I have had this happen as well. To test for this, remove the bowl and fill it with fuel to the top. Then observe for leaks. Don’t try to make this assessment visually as the cracks can be very difficult to detect by eye. Thanks Wintrsol.OK, try this: New Member Introduction
The leak could be the carb overflow drain, which is a brass tube inside the float bowl, and, if the float valve doesn't close all the way, will try to keep the fuel from filling the cylinder. Sometimes, that tube will crack and keep the fuel level too low to keep the bike running. Is it a steady dribble whenever the petcock is on, or just from time to time?
I am fairly sure that carb has a real choke plate, and not the starting enricher newer ones have, so starting on choke will require you to support the idle until the engine is warm enough.
You are correct. It is a CX 500 Deluxe with a shaft drive. Thanks for your input.Hi Howard,
To my knowledge, Honda did not produce a CB500 in 1981. Are you referring to the CX500 Deluxe? The sohc CB550 four cylinder bikes were discontinued in 1978. The CX is a V-twin with transverse cylinders and shaft drive.
As to your problem it sounds like your carbs could use some cleaning/maintenance. Check to see if the gas is leaking out of the overflow tubes which run down from the bottom of the carb bowls. If this is the case you probably have a stuck or dirty float needle. Try tapping on the float bowl to see if it will free up a sticky float. If that does not work you will have to drop the bowl and clean the needle/seat. Crap from the tank can get down in there and get stuck. You can sometimes drop the bowl, turn on the gas, and let some fuel run through the valve into a small cup and let it flush out the valve. Otherwise you can spray some carb cleaner in there and get it out.
Check this out first. If the gas is leaking from another point, then you will have to address that situation. Good luck.
OK, so it is likely coming from the overflow tube. That could mean a sticking float valve or sinking float, or that crack in the overflow tube. Since you have to hold the throttle to keep it running, and if this is also necessary after warming it up on a ride, an overfilled carb could be the culprit. Running SeaFoam, while a good idea, won't help if you have bits of stuff stuck in the float valve, or the float has leaked and doesn't float as high as it should. I think you are going to need someone familiar with carb operation take a look. If you are near enough to St. Louis, MO, I would have a look at it.It is more of a steady drip only when I am running the engine.